[Iverilog-devel] Numeric attributes

[Stephen W. <st...@ic...>]

Recently I noticed that there may be a problem with numeric attributes
at the ivl_target.h API. Specifically, the API is converting numeric
attributes to host integers. This winds up truncating values to 64
(63) bits, and drops x and z bit values. My reading of the standard is
that numeric attributes have no such limitations, so it appears that
the API is wrong.

So, my questions are:

1) Anybody out there using attributes? They are accessible at the
ivl_target.h API level, so if you are writing code generators, you
might be using attributes. I don't think they are available through
PLI.

2) Anybody have an opinion on whether numeric attributes are treated
as 4-value logic in other tools? Or am I fooling myself and numeric
attributes really do evaluate down to host integers?

3) What do other tools do?


-- 
Steve Williams                "The woods are lovely, dark and deep.
st...@ic...              But I have promises to keep,
http://www.icarus.com         and lines to code before I sleep,
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